قائمة الطعام
Boron removal by electrocoagulation: Removal mechanism, adsorption models and factors influencing removal. Ming Chen, Orion Dollar, +3 authors. E. Peltier. …
The removal of boron from silicon is a crucial step for silicon purification by the metallurgical route. The mechanism of boron removal was investigated by a combined method of using calcium silicate slag containing CaCl 2 and O 2 gas blowing. It is proved both experimentally and theoretically that the combined refining method is favorable for …
The boron removal mechanism includes anion exchange between the boron and nitrate and selective chemisorption between the boron and oxygen-rich functional groups of the CQDs/LDHs. Demirçivi et al. (2018) developed a novel perlite-based boron adsorption method. This method used modifying agents (hexadecyl …
The main B peak effectively explains the Boron removal mechanism. Combined with the result of ATR-FTIR, it can be assumed that the removal of Boron from fracturing flowback fluid was mainly through the complexation of ferric hydroxide and aluminum hydroxide. Moreover, two kinds of hydroxide may produce more sites for B, …
The specific objectives were: (1) to examine the mechanism(s) of B removal; (2) to develop quantitative models describing B removal by aluminum EC; (3) to …
Various boron selective adsorbents have been developed to improve the removal efficiency of boron from seawater, geothermal water or other waters considered potable or irrigation water [17], [18]. Almost all boron selective resins contain N -methyl- d -glucamine, hydroxyl, pyrocatechol, etc., and these contents mobilize boron on the …
An overview on this topic is provided. Needs are identified considering information regarding boron level effect on environment, human health and activities. Challenges are described envisaging boron main physical–chemical properties and current approaches for its removal. Perspectives are sketched pointing to possible technology …
The removal of boron from silicon by top blowing of humidified hydrogen has been studied in the present work through experimental work, thermodynamic calculations, computational fluid dynamic modeling, and quantum chemistry calculations. The effect of process parameters; temperature, lance diameter, lance distance from the melt surface, gas flow …
As mentioned in Section 3.3, metal oxides and hydroxides could adsorb boric acid through surface complexation, which has been proved to be the main mechanism of boron removal in EC as well (Chen ...
Keywords: Silicon, Refining, Boron, Gas, Steam, Kinetics, Mechanism . Abstract The removal of boron from silicon by top blowing of humidified hydrogen has been studied in the present work throughexperimental work, thermodynamic calculations, computational fluid dynamic, and modelingquantum chemistry calculations. The effect of process
"Boron removal by electrocoagulation: Removal mechanism, adsorption models and factors influencing removal". Water Research 170 (C). Country unknown/Code not available.
This paper critically reviews various technologies used for boron removal, including those recently developed, electrocoagulation (EC) and double-layered …
Mechanisms and Kinetics of Boron Removal from. Silicon by Humidified Hydrogen. JAFAR SAFARIAN, KAI TANG, JAN ERIK OLSEN, STEFAN ANDERSSON, GABRIELLA TRANELL, and KJETIL HILDAL. The removal of ...
Functionalization of Regenerated Cellulose Membrane via Surface Initiated Atom Transfer Radical Polymerization for Boron Removal from Aqueous Solution. Langmuir 2011, 27 (10), 6018-6025. ... Mechanisms of Boron Removal with Electrocoagulation. Environmental Chemistry 2006, 3 (5), 350.
Boron has been widely used in various manufacturing industries, and the level of boron in the industrial effluent can range from as high as several grams per liter to as low as a few micrograms per liter. Due to the potential adverse health effect of boron on human beings, the World Health Organization (WHO) has provided a guideline for the …
Request PDF | Boron removal by electrocoagulation: Removal mechanism, adsorption models and factors influencing removal | Boron (B), normally present in ground water and sea water, is a vital ...
However, to our knowledge, boron removal mechanisms during frac water treatment using the other common coagulant, iron, has not yet been investigated. It is emphasized that electrocoagulation is still an emerging and energy-intensive technology that needs additional on-site testing for successful field-implementation (Chellam and …
Boron (B), normally present in ground water and sea water, is a vital micronutrient for 10 plants, but is also toxic in excessive amounts. Under typical conditions, aqueous boron is present 11 as boric acid (H3BO3), which is uncharged, making B particularly challenging to remove by 12 mechanisms commonly applicable to removal of trace constituents.
Removal of boron from boric acid and tetraborate solutions by hydrotalcite (HT)-like, carbonate-free, Mg–Al–NO 3-layered double hydroxide (LDH) was studied.Data from batch experiments were computed as a function of the adsorbent dose and contact time. Synthesis in CO 2-free conditions provided a material with high anion exchange …
The boron removal mechanism includes anion exchange between the boron and nitrate and selective chemisorption between the boron and oxygen-rich functional groups of the CQDs/LDHs. Demirçivi et al. (2018) developed a novel perlite-based boron adsorption method. This method used modifying agents (hexadecyl …
Boron removal and recovery from water and wastewater. Review paper. Published: 08 August 2022. Volume 21, pages 635–664, ( 2022 ) Cite this article. …
Boron is present in the form of boric acid (B(OH) 3 or H 3 BO 3) in seawater, geothermal waters, and some industrial wastewaters but is toxic at elevated concentrations to both plants and humans.Effective removal of boron from solutions at circumneutral pH by existing technologies such as reverse osmosis is constrained by high energy …
Based on the literature, two mechanisms have been proposed for the removal of boron from solutions: (1) electrostatic attraction between the negatively …
Boron removal by Al-EC from solutions with varying NaCl concentrations: (a) Boron 477 removal versus time at 0.50 A; (b) Mean effective size of Al solids and total Al generated after 30 478 and 60 min at 0.50 A; (c) Boron removal over time at 0.35 A with 600 and 2,000 mg/L as NaCl 479 added.
To enhance the generation of hydrogen peroxide (H2O2), a modified graphite felt cathode doped with nitrogen and boron was developed and used in peroxi-coagulation system to degrade dimethyl phthalate (DMP). After a simple modification method, the yield of H2O2 on cathode increased from 9.39 to 152.8 mg/L, with current …
The rate of boron removal is increased with increasing the gas flow rate due mainly to the better supply and transport of the gas over the melt surface, as confirmed by the CFD modeling. Moreover, the rate of boron removal in alumina crucible is the highest followed by that in quartz and graphite crucibles, respectively. Faster B removal in ...
For effective removal of the impurity during the primary Si growth, a study on the interaction mechanism between the primary Si and the impurity phases should be of great importance. In this work, in order to achieve high B removal efficiency of the primary Si in the Al-Si alloys, the control of kinetic factors and the addition of a small ...
Despite being an economic and feasible process, the main drawbacks of boron removal by adsorption include the nanoscale parameters of most adsorbents, which restrict the easy recovery and regeneration of the adsorbent. To overcome this challenge, different nanosized adsorbents … See more
Request PDF | Boron removal from hydraulic fracturing wastewater by aluminum and iron coagulation: Mechanisms and limitations | One promising water management strategy during hydraulic fracturing ...
During the process of boron removal, two mechanisms work together to effectively inhibit the diffusion of boron. First, the polyhydroxy PVA can form large size complexes with boric acid. Second, the sulfonate group reduces the hydrogen bonding sites on the membrane surface. RO0 and RO3 membranes have also been systematically …
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